• 한국기계기술학회지
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• 제13권3호
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• pp.73-79
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• 2011

In this study, an analytical realization of end-milling system was introduced using recursive parametric modeling analysis. Also, the numerical mode analysis of end-milling system with different conditions was performed systematically. In this regard, a recursive least square modelling algorithm and the natural mode for real part and imaginary one was discussed. This recursive approach (RLSM) can be adopted for on-line end-milling identification. After experimental practice of the end-milling, the end-milling force was obtained and it was used for the calculation of FRF (Frequency response function) and mode analysis. Also the FRF was analysed for the prediction of a end-milling system using recursive algorithm.

• Asia pacific journal of information systems
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• 제10권2호
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• pp.71-95
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• 2000

Despite repeated exhortation about the importance of social and human dimensions of systems development, socio-organizational issues continue to be neglected and ignored in the current information systems practice. A review of the human information processing literature suggests that the reasons for this continuing lack of attention to social issues may be found in the limitations of human cognition and information processing capacities. Bostrom and Heinen(1978) and Kumar and Bjorn-Anderson(1990) also suggest that the inadequate attention to social problems and issues by the analyst could originate from the analysts limited problem perception. This research explores how the representation forms of information systems(IS) methodology used in understanding and modeling the problem situation affect such systems development problem perception. Typically, a system development methodology prescribes the use of system models(i.e., system representations) to understand, analyze, evaluate, and design the information system. Given the size and complexity of information systems, and the abstraction and simplification underlying the modeling process, system representations usually depict only a limited set of aspects of the system. Thus, a methodology whose representations are limited to technical aspects will tend to limit the analyst's perspective to a technical one only(Kumar & Welke, 1990). Following the same line of argument, in contrast, it is the conjecture of this study that a methodology which specifies both social and technical aspects of IS development will help the analyst develop a more comprehensive view of the IS problem domain. Based on the above concept, a theoretical model was first developed which explained the systems analysts cognitive process. Drawing on this model, a research model was developed hypothesizing the impacts of representation forms on problem identification. The model was tested using a laboratory experiment with 70 individual subjects. A special computer software was developed with a hypermedia authoring tool to conduct the experiments in order to avoid experimenter biases and to maintain consistency in administrating repeated experiments. The program, designed to replace the experimenter, consisted of functions such as presenting the subjects with problem material, asking the subjects questions, and saving the typed answers of the subjects. The results indicate that representation forms strongly influence problem identification. It was found that the use of the socio-technical representation form led to the findings of more social problems than the use of technical representation form. The results imply significant effects of representation forms on problem findings and also suggest that the use of adequate representation forms may help overcome dysfunctional effects of our limited information processing capacity.

• 한국산학기술학회논문지
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• 제16권12호
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• pp.8940-8947
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• 2015

자동차 조립산업에서는 다양한 제품의 요구사항에 신속히 대응하기 위해 혼합형 모델 조립생산 방식이 널리 활용되어 왔다. 그러나 이 모델은 부품의 혼돈을 유발할 수 있는데, 혼합형 모델 조립라인에서 부품이 물리적으로 뒤바뀔 때 발생하는 조립오류의 원인이 될 수 있다. 최근 RFID와 ZigBee 무선센서네트워크와 같은 새로운 기술을 조립공정에 적용함으로써 이와 같은 생산 시스템에서 IT 인프라를 통한 실시간 정보를 활용할 수 있게 되었다. 본 논문은 혼합형 모델 조립라인에서 조립공정을 위한 RFID와 ZigBee 무선센서네트워크 활용을 제안한다. 먼저, 조립공정에서 정확한 부품을 선택하기 위해, 조립라인 상의 각 칵핏모듈에 RFID 태그를 부착하고, 이러한 태그를 RFID 리더기를 사용하여 스캔한 뒤 차량의 정보를 인식하고, 칵핏모듈의 각 부품은 바코드를 부착하여 바코드 리더기를 사용하여 스캔하여, 해당 부품이 조립될 차량의 칵핏모듈의 정확한 부품임을 확인한다. 다음으로 본 논문은 자동차 회사로부터의 다양한 주문과 신차 모델에 따른 조립라인에서의 공정의 변화와 재구성에 따라 발생하는 RFID 장치들과 IT서버 시스템 사이의 유선통신용 케이블 포설과 불편함을 제거함으로써 조립오류와 비용을 줄일 수 있는 가변구조 혼합형 모델 칵핏모듈 조립생산방식을 위해 ZigBee 무선센서네트워크 기반의 응용을 제안한다. 마지막으로 제안한 방식을 적용한 수년간의 운영 결과를 제시한다.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2012년도 춘계학술발표대회
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• pp.66.1-66.1
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• 2012

Although all printed cost-less radio frequency identification (RFID) tags have been considered as a core tool for bringing up a ubiquitous society, the difficulties in integrating thin film transistors (TFTs), diodes and capacitors on plastic foils using a single in-line printing method nullify their roles for the realization of the ubiquitous society1,2. To prove the concept of all printed cost-less RFID tag, the practical degree of the integration of those devices on the plastic foils should be successfully printed to demonstrate multi bit RFID tag. The tag contains key device units such as 13.56 MHz modulating TFT, digital logic gates and 13.56 MHz rectifier to generate and transfer multi bit digital codes via a wireless communication (13.56 MHz). However, those key devices have never been integrated on the plastic foils using printing method yet because the electrical fluctuation of fully printed TFTs and diodes on plastic foils could not be controlled to show the function of desired devices. In this work, fully gravure printing process in printing 13.56 MHz operated 32 bit RFID tags on plastic foils has been demonstrated for the first time to prove all printed RFID tags on plastic foils can wirelessly generate and transfer 32 bit digital codes using the radio frequency of 13.56 MHz. This result proved that the electrical fluctuations of printed TFTs and diodes on plastic foils should be controlled in the range of maximum 20% to properly operate 32 bit RFID tags.

• 한국도서관정보학회지
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• 제12권
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• pp.61-96
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• 1985

The human subject analysis of a document has some critical problems. The method results in the inconsistency in analysis process and the contradiction of two objects of the subject analysis (one is the identification of the content for the retrieval of specific items and the other is to identify the content for the grouping of related materials). Since the subject analysis by mechanized has been recognized to be the possible way to aggregate the problems of manual analysis, various a n.0, pproaches of automatic indexing have been studied and experimented. This study is to examine the automatic indexing as one of the promising subject analysis techniques by statistical, syntactical and semantic a n.0, pproaches. In conclusion, the reasonable a n.0, pplication time of the automatic indexing should be made a decision based on the through investigation on the cost verse effectiveness, and automatic indexing system should be developed in the close relationship with the on-line search which is a good retrieval system for information explosion society. From now on, since the machine-readable document-text will be envisaged to be more and more available due to the rapid development of computer technology, the more substantial research on the automatic indexing will be also possible, which can bring about the increasing of practical automatic indexing systems.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제2권5호
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• pp.223-230
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• 2013

IT기술의 급속한 발전으로 인해 인터넷 상에서 많은 사람들이 메신저를 이용해 실시간으로 대화를 나누거나 업무처리를 위한 파일 공유 등에 메신저를 사용하고 있다. 하지만 이런 편리성을 이용해 금전 요구 등의 메신저 피싱 범죄가 발생하고 있으며, 범죄자가 자신이 접속한 IP 주소를 은닉하기 위하여 Proxy와 같은 우회기법을 사용할 경우 범죄자의 Real IP 주소를 확인하는 것은 어려운 실정이다. 본 논문은 ARIT 기법을 이용해 2채널 방식으로 접속 IP 주소와 ARIT Agent를 이용해 얻은 Real IP 주소를 수집하여 별도의 확인 과정을 거친 후, 사용자가 정상적인 방법으로 접속했는지 여부를 판단하여 사전에 발생할 수 있는 메신저 피싱에 대응할 수 있는 방안에 대해 제시하고자 한다.

• 감성과학
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• 제6권2호
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• pp.1-7
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• 2003

본 연구에서는 인간의 감성에 반응하는 디지털 벽면을 통하여 색채 감성 반응에 대한 연구를 목표로 한다 사용자의 감성 반응에 대한 연구 단계로는 첫째, 감성 어휘에 따른 반응을 조사한다. 둘째, 감성어휘에 따라 색채 배색의 데이터를 형성한다. 셋째, 자동적으로 가상공간에서 사용자의 감성어휘에 따라 색채감성공간을 연구한다. 건축공간의 물리적 특성의 한계에서 유동적인 감성반응 환경의 요구를 충족시키는 데에는 많은 한계점이 따른다. 그래서, 본 연구에서는 이러한 한계점을 극복하기 위해 디지털 환경을 이용한 가상공간에서 실행하였다. 이는 실제공간에서의 시행착오를 줄일 수 있을 뿐만 아니라 빠른 시간 내에 인간의 반응을 연구할 수 있다. 특히, 본 연구에서는 감성반응의 실내배색에 의해 실내공간에서의 디지털 벽면의 디자인을 가상공간에서 개발하여 거주자의 감성 반응을 평가하는 것을 연구 목적으로 두었다. 이와 같은 거주자의 감성반응형 환경 디자인은 미래의 디자인의 패러다임이 될 것이다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.524-529
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• 2004

In this paper, We described the method which developed the optimal control system for air separation unit to change production rates frequently and rapidly. Control models of the process were developed from actual plant data using subspace identification method which is developed by many researchers in resent years. The model consist of a series connection of linear dynamic block and static nonlinear block (Wiener model). The model is controlled by model based predictive controller. In MPC the input is calculated by on-line optimization of a performance index based on predictions by the model, subject to possible constraints. To calculate the optimal the performance index, conditions are expressed by LMI(Linear Matrix Inequalities).In order to access at the Bailey DCS system, we applied the OPC server and developed the Client program. The OPC sever is a device which can access Bailey DCS system.The Client program is developed based on the Matlab language for easy calculation,data simulation and data logging. Using this program, we can apply the optimal input to the DCS system at real time.

• 한국정보통신학회논문지
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• 제7권5호
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• pp.934-940
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• 2003

본 논문은 헤어 뷰티 패션 디자인(Hair Beauty Fashion Design)을 위한 헤어모델과 헤어 얼굴 특징 점을 검출하여 긴 머리, 짧은 머리, 올림머리 등을 연출하는 헤어 라인 검출을 연구한다. 헤어 얼굴은 Gabor 특징에 의하여 지정된 특징 점의 교점 그래프와 공간적 연결을 나타내는 에지 그래프 헤어 모델로 표현한다. 제안된 탄력적 특징 정합은 헤어 모델과 헤어 입력 영상에 상응하는 특징을 취하여 정합 헤어 모델에서 국부적으로 경쟁적이고, 전체적으로 협력적인 헤어 모델 구조를 제시하며, 또 헤어 영상공간에서 불규칙 확산 처리와 같은 역할도 한다. 복잡한 헤어 얼굴 배경이나 헤어 모델 자세의 변화, 그리고 왜곡된 헤어 얼굴 영상에서도 원활하게 동작하는 헤어(얼굴)설계 식별 시스템을 구성함으로서 헤어 라인응용의 방법 등을 탄력적 특징적 정합으로 검출한다.

• 유통과학연구
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• 제14권3호
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• pp.11-22
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• 2016

Purpose - This study empirically validates the theoretical argument of the effect of authentic leadership on organizational citizenship behavior, and the mediating roles of followers' self-awareness and psychological ownership between authentic leadership and followers' organizational citizenship behavior. Research design, data, and methodology - A total of 380 office workers in Korea were surveyed through on-line, and the result was analyzed using confirmatory factor analysis and structural equational modeling. Results - The authentic leadership was shown to be related positively to followers' self-awareness and psychological ownership, both of which were associated positively with their organizational citizenship behavior. The complete mediating effects of followers' self-awareness and psychological ownership were verified between authentic leadership and follower's organizational citizenship behavior. Conclusions - While followers' self-awareness was rarely studied in the authentic leadership study to date, it was found to play a role in the authentic leadership process into organizational outcome. It is argued that the followers' self-awareness as a mediating role between authentic leadership and organizational outcome seems to be more appropriate than the leader' s identification of previous thesis in explaining the authentic leadership effect.